Fatigue life analysis of automotive key parts based on improved peak-over-threshold method

被引：60

作者：

Liu, Xintian ^{[1
]}

Zhang, Minghui ^{[1
]}

Wang, Haijie ^{[1
]}

Luo, Jiao ^{[1
]}

Tong, Jiachi ^{[1
]}

Wang, Xiaolan ^{[1
]}

机构：

[1] Shanghai Univ Engn Sci, Sch Mech & Automot Engn, Shanghai, Peoples R China

来源：

FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES | 2020年 / 43卷 / 08期

基金：

中国国家自然科学基金;

关键词：

generalized Pareto distribution; load spectrum; load-spectrum extrapolation; mixture distribution; peak-over-threshold; LOAD SPECTRUM; EXTRAPOLATION; DAMAGE; TIME; RELIABILITY; PREDICTION;

D O I：

10.1111/ffe.13235

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

To eliminate the limitations of the peak-over-threshold (POT) extrapolation method, the paper proposes an improved POT extrapolation method to reconstruct the load sequence and frequency of the part. A threshold model is established based on a generalized Pareto distribution (GPD). Assuming a road surface's irregularity obeys a normal distribution, the load between the upper and lower thresholds is reconstructed to obtain more dynamic road load data. Rain-flow counting method is used to calculate the peak-to-valley value and frequency of the load signal, and the characteristics of the load mean and amplitude before and after the improvement of the POT extrapolation method were discussed. The effectiveness and conservativeness of the enhanced method are verified by predicting the fatigue life of a swing support rod.

引用

页码：1824 / 1836

页数：13

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